This bug was filed from the Socorro interface and is report bp-cf4c9ee1-b61f-4ff2-a7e5-2b3ae0170612. ============================================================= There are 6 crashes (from the same installation) in nightly 55 with buildid 20170612030208. In analyzing the backtrace, the regression may have been introduced by patch  to fix bug 1367905.  https://hg.mozilla.org/mozilla-central/rev?node=22c8d6540061dc3d016bb25568b477f72562accb
bug 1367905 might have revealed some old bug, but not cause this.
I'm looking at the relevant code a bit.
status-firefox55: affected → fix-optional
status-firefox56: affected → fix-optional
We haven't seen any new instances of this crash in three months. I'm going to close this.
Status: NEW → RESOLVED
Last Resolved: 6 months ago
Resolution: --- → WORKSFORME
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